Product specifications
ProSavageDDR P4M266 – VT8751 P4 DDR SMA North Bridge
Revision 1.1, July 19, 2002 -28- Device 0 Register Descriptions
We Connect
We ConnectWe Connect
We Connect
Technologies, Inc.
Device 0 Offset 46 – NB V-Link Misc Control (00h)......RW
7 Downstream High Priority
0 Disable High Priority Down Commands .....def
1 Enable High Priority Down Commands
6 Downlink Priority
0 Treat Downlink Cycles as Normal Priority.def
1 Treat Downlink Cycles as High Priority
5-4 Combine Multiple STPGNT Cycles Into One V-
Link Command
00 Compatible, 1 command per V-Link cmd....def
01 2 commands per V-Link command
10 3 commands per V-Link command
11 4 commands per V-Link command
3-2 V-Link Master Access Ordering Rules
00 High priority read, pass normal read (not pass
write) .....................................................default
01 Read (high/normal) pass write (HR>LR>W)
1x Read / write in order
1-0 Reserved ........................................ always reads 0
Device 0 Offset 47 – V-Link Control (00h) .....................RW
7-3 Reserved ........................................ always reads 0
2 Auto-Disconnect
0 Disable ...................................................default
1 Enable
1 V-Link Disconnect Cycle for HALT cycle
0 Disable ...................................................default
1 Enable
0 V-Link Disconnect Cycle for STPGNT Cycle
0 Disable ...................................................default
1 Enable
Device 0 Offset 48 – NB/SB V-Link Configuration (18h)RW
7 Reserved ........................................always reads 0
6 Rest Bus Width Supported
0 Not Supported ....................................... default
1 Supported
5 16-bit Bus Width Supported
0 Not Supported ....................................... default
1 Supported
4 8-Bit Bus Width Supported
0 Not Supported
1 Supported .............................................. default
3 4x Rate Supported
0 Not Supported
1 Supported .............................................. default
2 2x Rate Supported
0 Not Supported ....................................... default
1 Supported
1-0 Reserved ........................................always reads 0
Device 0 Offset 49 – SB V-Link Capability (18h) ........... RO
7-6 Reserved ........................................always reads 0
5 16-bit Bus Width Supported .............................. RO
0 Not Supported ....................................... default
1 Supported
4 8-Bit Bus Width Supported ................................ RO
0 Not Supported
1 Supported .............................................. default
3 4x Rate Supported............................................... RO
0 Not Supported
1 Supported .............................................. default
2 2x Rate Supported............................................... RO
0 Not Supported ....................................... default
1 Supported
1-0 Reserved ........................................always reads 0